Stabilized 1,1-dichloro-1-fluoroethane, premixtures intended for the preparation of polymeric foams and polymeric foams obtained by the use thereof

Abstract

Compositions consisting essentially of 1,1-dichloro-1-fluoroethane and at least one stabilizing agent chosen from epoxides and hydrocarbons substituted by a nitro group. These compositions can especially be used as cleaning agent and as blowing agent for polyurethane foams.

We claim: 
     
       1. A composition consisting essentially of 1,1-dichloro-1-fluoroethane, at least one halide Lewis acid and at least one stabilizing agent for 1,1-dichloro-1-fluoroethane, selected from the group consisting of C 3  -C 8  epoxides, C 1  --C 8  hydrocarbons substituted by a nitro group and mixtures thereof. 
     
     
       2. The composition according to claim 1, including approximately 0.05% by weight of said stabilizing agent. 
     
     
       3. The composition according to claim 1, including approximately 0.1% by weight of stabilizing agent. 
     
     
       4. The composition according to claim 1, including both an epoxide and a hydrocarbon substituted by a nitro group. 
     
     
       5. The composition according to claim 4, including from approximately 0.01 to approximately 5% by weight of each stabilizing agent with respect to the total weight of the composition. 
     
     
       6. The composition according to claim 1, including approximately 1 g of each of said at least one stabilizing agent per 100 ml of 1,1-dichloro-1-fluoroethane. 
     
     
       7. The composition according to claim 1, wherein the stabilizing agent is chosen from vicinal epoxides containing from 3 to 5 carbon atoms. 
     
     
       8. The composition according to claim 7, wherein the stabilizing agent is chosen from 1,2-epoxypropane and 1,2-epoxybutane. 
     
     
       9. The composition according to claim 1, wherein the stabilizing agent is chosen from nitroalkanes containing from 1 to 6 carbon atoms and aromatic hydrocarbons substituted by a nitro group and containing from 6 to 8 carbon atoms. 
     
     
       10. The composition according to claim 1, wherein the stabilizing agent is chosen from nitromethane, nitroethane, 1-nitropropane and 2-nitropropane. 
     
     
       11. A composition consisting essentially of at least one polyol, and from approximately 0.01% to approximately 5% by weight, compared to the weight of the composition, of 1,1-dichloro-1-fluoroethane, at least metal halide Lewis acid, and at least one stabilizing agent for 1,1-dichloro-1-fluoroethane, selected from the group consisting of C 3  -C 8  epoxides, C 1  -C 8  hydrocarbons substituted by a nitro group, and mixtures thereof. 
     
     
       12. The composition set forth in claim 11, including approximately 0.1% by weight, compared to the weight of the composition, of said stabilizing agent. 
     
     
       13. The composition set forth in claim 11, including approximately 0.05% by weight, compared to the weight of the composition, of said stabilizing agent. 
     
     
       14. The composition set forth in claim 11, wherein said stabilizing agent includes both an epoxide selected from the group consisting of C 3  -C 8  epoxides, and a C 1  -C 8  hydrocarbon substituted by a nitro group.